Absolute Ultrasound Attenuation Measurements in Superfluid 3He in 98% Aerogel by Direct Transmission |
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| Authors: | Y Lee H C Choi N Masuhara B H Moon P Bhupathi M W Meisel N Mulders |
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| Affiliation: | (1) Microkelvin Laboratory, Department of Physics, University of Florida, Gainesville, FL 32611-8440, USA;(2) Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA |
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| Abstract: | Systematic investigations on the effect of static disorder on p-wave superfluid 3He have been made possible by utilizing the unique structure of high porosity silica aerogel. For the past 10 years, a burst
of experimental efforts revealed that three distinct superfluid phases exists. We have performed longitudinal ultrasound (9.5 MHz)
attenuation measurements in the B-phase of the superfluid 3He in 98% aerogel. The absolute attenuation was determined by direct propagation of sound pulses through the medium in a wide
range of temperatures, down to 200 μK, for sample pressures of 10 and 29 bars. Our results provide direct information on the
zero-energy density of states of the superfluid phase in aerogel originating from impurity scattering. |
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| Keywords: | 67 57 Pq 67 80 Mg |
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